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212 lines
No EOL
10 KiB
C++
212 lines
No EOL
10 KiB
C++
//======== (C) Copyright 2002 Charles G. Cleveland All rights reserved. =========
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//
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// The copyright to the contents herein is the property of Charles G. Cleveland.
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// The contents may be used and/or copied only with the written permission of
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// Charles G. Cleveland, or in accordance with the terms and conditions stipulated in
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// the agreement/contract under which the contents have been supplied.
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//===============================================================================
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#ifndef BALANCE_H
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#define BALANCE_H
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#include <string>
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#include <map>
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#include <memory>
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#include "../Balance.txt" //default balancing source - this used to be ../Balance.txt
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BalanceValueContainerFactory -- facade that creates, stores, and
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// maintains BalanceValueContainer objects. Multiple calls with the
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// same parameter will return the same object. The (void) function
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// call is equivalent to calling for a filename with an empty string.
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// Invalid filenames will still return an usable BalanceValueContainer,
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// but that container will not be able to save later.
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//
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// The objects that this function creates should not be manually
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// deleted; it is responsible for cleanup of the objects.
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//
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// TODO: Add another constructor for UPP::ProductInfo objects
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// TODO: Make retrieval/creation of objects thread safe (it's not)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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class BalanceValueContainer;
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namespace BalanceValueContainerFactory
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{
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BalanceValueContainer* get(const std::string& filename);
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BalanceValueContainer* get(void);
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const std::string& getDefaultFilename(void);
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};
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BalanceChangeListener -- abstract class that allows arbitrary
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// items to listen for changes to the balancing system. Items can
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// register for individual values or for the entire balance variable
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// set. Listeners are notified in advance of each change, but don't
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// have the authority to override.
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//
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// The shouldNotify function is a filter for items registered for
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// entire sets, allowing them to select items they are actually
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// interested in receiving. Items that are registered for specific
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// variables skip the shouldNotify check.
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//
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// When a BalanceValueContainer is wiped, the balanceCleared function
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// is called rather than iterating over all of the values for all of
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// the attached listeners. It should be considered a signal that
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// all items the listener is interested in have been removed.
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//
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// The BalanceStartCompoundChange and BalanceEndCompoundChange
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// functions provide rough grain functionality for listeners that
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// want to only operate once on a large change (such as a complete
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// reset) instead of once per change. By combining these functions
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// with an internal state variable, they can know when to ignore
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// individual signals. The compound change functions will not be
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// called for individual balance changes, so it's important to track
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// these as well if you want a catch-all method of detecting changes.
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//
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// The compound change functions will only be called for universally
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// registered listeners.
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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enum BalanceValueType {
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BALANCE_TYPE_FLOAT = 1,
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BALANCE_TYPE_INT = 2,
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BALANCE_TYPE_STRING = 3
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};
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class BalanceChangeListener
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{
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public:
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unsigned int getBalanceChangeListenerID(void) const;
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virtual ~BalanceChangeListener(void);
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virtual bool shouldNotify(const std::string& name, const BalanceValueType type) const;
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virtual void balanceCleared(void) const;
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virtual void balanceValueInserted(const std::string& name, const float value) const;
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virtual void balanceValueInserted(const std::string& name, const int value) const;
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virtual void balanceValueInserted(const std::string& name, const std::string& value) const;
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virtual void balanceValueChanged(const std::string& name, const float old_value, const float new_value) const;
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virtual void balanceValueChanged(const std::string& name, const int old_value, const int new_value) const;
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virtual void balanceValueChanged(const std::string& name, const std::string& old_value, const std::string& default_value) const;
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virtual void balanceValueRemoved(const std::string& name, const float old_value) const;
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virtual void balanceValueRemoved(const std::string& name, const int old_value) const;
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virtual void balanceValueRemoved(const std::string& name, const std::string& old_value) const;
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virtual void balanceStartCompoundChange(void) const;
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virtual void balanceEndCompoundChange(void) const;
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protected:
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BalanceChangeListener(void);
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private:
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const unsigned int BCL_ID; //handle for tracking registrations; internal use only
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};
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BalanceValueContainer -- abstract parent class for balance variable
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// storage and retrieval with change notification.
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//
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// It is possible to actually use the same name for multiple variable
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// types at runtime, but the results are undefined if the conflict
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// is saved or reloaded, so it's important to be careful when using
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// value types.
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//
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// When calling addListener, multiple registrations for the same
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// variable name or multiple global registrations have no added
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// effect. If a listener is registered globally and for a specific
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// variable, it will still only be called once per event.
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//
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// When calling removeListener without a name argument, only the
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// universal listener location is checked for the matching pointer.
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// It is safe to leave listeners registered with a container even
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// after the listeners have been deconstructed, so it is not required
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// to unregister a listener from many different items.
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//
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// The equality and inequality checks test the equality/inequality
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// of the value maps. The assignment operator performs the minimum
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// number of changes required for the value maps to become equal.
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// This is much more complex than simple reassignment, but it allows
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// proper notification of BalanceChangeListeners.
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//
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// TODO: Make addition/removal of listeners thread safe (it's not)
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// TODO: Make assignment thread safe (it's not)
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// TODO: Make insertion/retrieval/removal of values thread safe
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// TODO: Make load a minimal change operation (like assignment)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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typedef std::map<std::string,float> BalanceFloatCollection;
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typedef std::map<std::string,int> BalanceIntCollection;
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typedef std::map<std::string,std::string> BalanceStringCollection;
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class BalanceValueContainer
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{
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public:
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virtual ~BalanceValueContainer(void);
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virtual BalanceValueContainer& operator=(const BalanceValueContainer& other) = 0;
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virtual bool operator!=(const BalanceValueContainer& other) const = 0;
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virtual bool operator==(const BalanceValueContainer& other) const = 0;
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virtual bool load(void) = 0;
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virtual bool save(void) = 0;
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virtual const float get(const std::string& name, const float default_value) const = 0;
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virtual const int get(const std::string& name, const int default_value) const = 0;
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virtual const std::string get(const std::string& name, const std::string& default_value) const = 0;
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virtual const BalanceFloatCollection* getFloatMap(void) const = 0;
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virtual const BalanceIntCollection* getIntMap(void) const = 0;
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virtual const BalanceStringCollection* getStringMap(void) const = 0;
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virtual void insert(const std::string& name, const float value) = 0;
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virtual void insert(const std::string& name, const int value) = 0;
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virtual void insert(const std::string& name, const std::string& value) = 0;
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virtual void remove(const std::string& name) = 0;
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virtual void clear(void) = 0;
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virtual void addListener(const BalanceChangeListener* listener) = 0;
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virtual void addListener(const std::string& name, const BalanceChangeListener* listener) = 0;
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virtual void removeListener(const BalanceChangeListener* listener) = 0;
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virtual void removeListener(const std::string& name, const BalanceChangeListener* listener) = 0;
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protected:
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BalanceValueContainer(void);
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};
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BALANCE_VAR(x) macro - the heart of the balance system, ties value
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// to default balance source if PLAYTEST_BUILD is enabled, uses
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// hardcoded value otherwise. Place the name of the varaible #define
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// in Balance.txt as the value in the macro.
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//
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// BALANCE_LISTENER(x) macro - for registering global
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// BalanceChangeListeners (see below), reverts to no operation
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// if AVH_PLAYTEST_BUILD isn't enabled.
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//
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// BALANCE_FIELD_LISTENER(x,y) macro - for registering field-specific
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// BalanceChangeListeners, reverts to no operation if
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// BALANCE_ENABLED isn't defined
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#ifdef BALANCE_ENABLED //use Balance.txt values on server, no-source/explicitly set values for client
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#ifdef SERVER
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#define BALANCE_DEFNAME BalanceValueContainerFactory::getDefaultFilename()
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#else
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#define BALANCE_DEFNAME ""
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#endif
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inline void BALANCE_LISTENER(const BalanceChangeListener* object) { BalanceValueContainerFactory::get(BALANCE_DEFNAME)->addListener(object); }
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inline void BALANCE_FIELD_LISTENER(const BalanceChangeListener* object, const char* field) { BalanceValueContainerFactory::get(BALANCE_DEFNAME)->addListener(field,object); }
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#define BALANCE_VAR(name) GetBalanceVar(#name,name) //requires macro for string-izing of name
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inline int GetBalanceVar(const char* name, const int value) { return BalanceValueContainerFactory::get(BALANCE_DEFNAME)->get(name,value); }
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inline float GetBalanceVar(const char* name, const float value) { return BalanceValueContainerFactory::get(BALANCE_DEFNAME)->get(name,value); }
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inline float GetBalanceVar(const char* name, const double value) { return BalanceValueContainerFactory::get(BALANCE_DEFNAME)->get(name,(float)value); }
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inline std::string GetBalanceVar(const char* name, const char* value) { return BalanceValueContainerFactory::get(BALANCE_DEFNAME)->get(name,value); }
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#else
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#define BALANCE_VAR(name) name //hardcodes the value at compile time
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#define BALANCE_LISTENER(object)
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#define BALANCE_FIELD_LISTENER(object,name)
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#endif //BALANCE_ENABLED
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#endif //BALANCE_H
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